[US] How many overlap there is ?

**As** Santa Claus
**I want to** know how many overlap there's in assignements
**So** I can reassign elves

**More information :**

https://adventofcode.com/2022/day/4

**Test data**

```
2-4,6-8
2-3,4-5
5-7,7-9
2-8,3-7
6-6,4-6
2-6,4-8
````

Will return 2 overlap